diff options
author | Paul Mundt <lethal@linux-sh.org> | 2010-10-14 03:04:44 +0900 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2010-10-14 03:04:44 +0900 |
commit | 47da88f36639b8de57f6cdd680f8c27528ccd67c (patch) | |
tree | 2c5cf30f6fb84366277fcbec57a0c8cc04f64282 /arch/sh/boards/mach-sdk7786 | |
parent | 550a1ef18a53cae3d908edceca9daaafbedcf12f (diff) |
sh: mach-sdk7786: Add support for fpga gpios.
The sdk7786 FPGA supports a number of user settable input switches that
are otherwise unused. This wires up a dummy gpio chip for the switch bank
to simply expose them to userspace.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/boards/mach-sdk7786')
-rw-r--r-- | arch/sh/boards/mach-sdk7786/Makefile | 2 | ||||
-rw-r--r-- | arch/sh/boards/mach-sdk7786/gpio.c | 49 |
2 files changed, 51 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-sdk7786/Makefile b/arch/sh/boards/mach-sdk7786/Makefile index a29f19e85b6..d0f801bd841 100644 --- a/arch/sh/boards/mach-sdk7786/Makefile +++ b/arch/sh/boards/mach-sdk7786/Makefile @@ -1 +1,3 @@ obj-y := setup.o fpga.o irq.o + +obj-$(CONFIG_GENERIC_GPIO) += gpio.o diff --git a/arch/sh/boards/mach-sdk7786/gpio.c b/arch/sh/boards/mach-sdk7786/gpio.c new file mode 100644 index 00000000000..f71ce09d4e1 --- /dev/null +++ b/arch/sh/boards/mach-sdk7786/gpio.c @@ -0,0 +1,49 @@ +/* + * SDK7786 FPGA USRGPIR Support. + * + * Copyright (C) 2010 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/gpio.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/spinlock.h> +#include <linux/io.h> +#include <mach/fpga.h> + +#define NR_FPGA_GPIOS 8 + +static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = { + "in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7", +}; + +static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) +{ + /* always in */ + return 0; +} + +static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio) +{ + return !!(fpga_read_reg(USRGPIR) & (1 << gpio)); +} + +static struct gpio_chip usrgpir_gpio_chip = { + .label = "sdk7786-fpga", + .names = usrgpir_gpio_names, + .direction_input = usrgpir_gpio_direction_input, + .get = usrgpir_gpio_get, + .base = -1, /* don't care */ + .ngpio = NR_FPGA_GPIOS, +}; + +static int __init usrgpir_gpio_setup(void) +{ + return gpiochip_add(&usrgpir_gpio_chip); +} +device_initcall(usrgpir_gpio_setup); |